Craig stole coins from a Viking Treasure Chest at the Bottom of Loch Ness The coins Craig stole from the Vikings were either blessed or cursed. They brought him back to Nessie’s lair. A rock concert with their favorite singer is about to perform at Urquhart Castle. But the sound waves from the wild music are causing chaos in Nessie's Grotto. What can Craig and Linda do to protect Nessie and her children? And still get to hear their favorite singer?

Craig and Linda's parents have taken them to Canada this summer—far away from "that wicked monster Nessie." Luckily, a secret passageway connects Loch Ness in Scotland and Lake Memphrémagog in Quebec. The passageway is part of a crumbling stone maze. Nessie's daughter, the Princess Sheona, has become trapped in the maze. Craig and Linda pay their last visit to Nessie's Grotto Will frightened friend, 7-year-old Angus, and his giant sister Haining get along with Nessie?